Key Features Makes tap water safe for pond fish Removes harmful chemicals like chlorine. Adds essential vitamins like B1 for added stamina and to help protect against infections. Easy to use 250ml treats 5688 Litres (1250 Gallons) Tap water can be dangerous for ponds and the pond life inside it. The water contains chemicals that, while safe for humans, are dangerous for pond fish. Banish Pond Dechlorinator completely conditions tap water by removing all harmful chlorine compounds including chloramine and metal ions. The Dechlorinator treatment treats this harmful water and adds essential vitamins like B1 that can help build stamina , add vitality and protect fish against infection. It also neutralises all pollutants in the water making it a safe and healthy pond system. The treatment is safe and simple to use. Simply add 10ml per 225 Litres (50 gallons) of pond water and pour into the pond before introducing fish.